Plate finishing apparatus



Nov. 23, 1943. L. G. oLANDER 2,334,787

PLATE FINI SHING APPARATUS Filed Nov. 6, 1939 2 Sheets-Sheet l NOV. 23,1943. 1 OLANDER `2,334,787

?LATE FIN ISHING APPARATUS Filed Nov. 6, 1939 2 Sheets-Sheet 2 'Y- Patented New.V 23V, 'y

' *PLATEFiNISmGAPrARATvS K LeonardGlOlanderiMinli'nolis, i

to The Monomclt Companmlnc., Minneapolis,

`This invention 4relatesto a rriachi'ne havingfa rotating'cutter of cylindricall type `fbi" finishing articles, one embedirnentof the V inventionbeing j.

that of `a machine for 'ni'shi'rigf printing' plates;

These `plates must be qite accurately fnishdo nepneanenivwember-e, 193.95 serial No; stegen fzfeieims lolje--Qisij f cutteejlz, said tablenaving-vllshapedguide por- 'quicklviand efcientlv done.

` It is an object fithisri moved int the patnfbrtnefcuttr':

Ity is a further object fof the inyen videV a workVr holding `means ing movementtowa bination with adjustable swinging movemeritof said first merino dmeans l i ttoward or'fromftle work.

It is anoth 'r obj'efctof theY invention toA provide Y,

" sucgh a machine having'-ja rotating c1 itter`, 'a table for supporting the work 'and' Inovirigi thejksanie toward and'past said cutter," arnotorforfrnovof saidfmotor,

on said tableshould a cut oa certain deptlr'bev ,attempted 4and .means actuatedby V-rlnovfernent'of said member by the work foro'ening 'saidswtch 1 fl and stoppingthe novernent ofjsaid table',` 1

These ndfo'ther objects alrrddvantagesof the Y `f ullv set forth .in the followingQ invention( Will fl ce description made 'nconnection the acconti-V panying drawings Jin vlwhich vlike1"eferer` 1ce char- `:acters refer to siniilar `parts`fthrough`o1t 'the sev-j eral views and in which;

Fig 1 is a vertical sectionf through a pofrtion.: of the frame 2 and table -of saidmachine Showing Referring tothe comprising `:side frame'm'ernber'suill; the Vserine be- 5 ing' illnstratdias havingcapritiriions4 Ilm se# drical cutter lf2 having ircllmferentially spa-ce d helicallY @Xtending teeth i 2q thereon. [Members l0 have[flangesl cutter l2 isthus or i3 extends between thecanmembers lila,A the same being" shown as having afnnt M at'one end j engaging oneof .said,cap'nernb'ers.lA table l5.,

is providedV whichis longitudinally movableebe nvntion .to"provide' af, workh'oldingor engagingjneans forf-suchfafnfiaf l f chine vs o constructed andYarrangedj"that'should the ctterlift/the work/Said I rean's willibe.

`a member n'gageable Yby the work vertical section taire@` subsidiar-,mw

tions) 5av movable 'guide Vn'ieifibers l .A A wedge '.fi'l isshown in onefoiisai'd members i6.

quideljmembefs ne are Vearned on' pins .rs` aise receivecl in asppcrting member I9. `The parts sdfardescribed' arefnot new with this invention blicantfs Comprisi c, a

A work engaging` orA vvV22 respectively-[Bar {il} also has'scured thereto the f orrn` 'o .liigs proj ecti'ngI from brackets 2 l' 'and et its ends @standing-reds `2 5kg .A tensile .coiled sprin'g is connected t'cftl'ie' upperfendof each rod; 25 and thesame extendslengthwise ofthe 'e macliine'and isf'connected at its? other end-tothe upper-end of a lever arm 21d to be later described.

"Ariotner wn'rkl engagfmgfor work hon-imgV member "as is `provided beyond member ze, thesame -be- "i fing in Athe form iifaatbanhaving end trunnion' or pivotporticns 23a, Ajciirn'aled in bracketsV zljand v22.

Member @also Vliefs carried therein adjacent its ends s' crews29 adapted* to engage iat theirends with "stop 'members 'in' the 4 forni of flge ;Elbprojecting,frein brackets Eiland-'.221 A berfar eachien'd of rnember'l atthelower sidetherev v of, the same vbeing connected at their lotlfiermends pins 3l. projecting;V inwardly frorrrrarne rnembersi il). It will be'seenthat` by adjiist'rnentl Y of screws 25! and ZSthe positions ofthe worl; engaging.. portions of j members '25 and" 23 maybe j respectively varied',

Anothervwork engaging or `Awork helding-inem? is provided compri' ing a .bar extending `tra"sverselv' of the'lfnacliine, the saine having rendi.. brackets'. 2l and 22 Said: r'nernber El has lever nion or pivot nortficns'4 2lb journaledin arrnsgla, extending vertically ,at each end thereof beyond the ends of cutter i2 andV aspreviously fstatdlthe springs `'.fliare connectedltothe ends Y of lever arrns'a. .Braclets 2i and'li'g have lugs 2id `and 22d respectively projectinginwardly* therefrom yand screwsjili 'extend through" Said lugs', said screwshaving thereonjjamb nuts 35.

Screws 3d' arendanted toat times engage lever `arrns'la when saiderrns are swung against the a' plaeparanei Vwith the axis or f previously Ylissiiedf Betel/1t; No. 2,153,243,

29 `the"sainelfias therein'- Sciews'cl' adapted VA member 4G extends across the machine in its ends on arms 4| to which it is connected by screws 42. Arms 4| are connected to vshort-shafts 43 by set screws 44, which shafts are ournaled in bearings i5 having arms extending to and connected to the bracketsj'Zl .and 22 by screws 46. At the outer side of bearings 45 one of .the

shafts 43 has secured'thereto a block 4l. Block Ylll has .an arm dlafextending toward cutter` t2, the-end kofAvl/.hichv arm .has secured tthereto .a tensile coiled spring 4.8, the `other end .of ywhich is connecteur@ .a 210111,49 projecting-from bracket .22. .Spring 43 holds varm 41a in .contact .with -a'gz portion lof bearing `bracket v45 so that member 4.1 .normally-:occupies itheposition shownin Fig. 4 with arm 49m .substantially horizontal. Member front of cutter |2the same being isuppvrted at 4.1 has -a somewhatpointed lower end Mbwhich',

directly overlies andnormally.` substantiallyyen- .gages-the top of :anarm 59 carried a shaft and sproje-cting therethrough. Said shaftfiahas secured thereto beyond pivotpin-EZ hy which it isonnectedjtoa pawl lillaA jcurnaled in one vof the side .frnembers VIl! said member t an arm which is boredV .at .its other fend to .receive a" torsionspring' 54 Isurrounds .pivoti and :has :end Y portion-sfengaging 'members .Erl fand 53; Members `5l have atisurtacesiengaging eachother so .that whenfsaid members are in alinementthey' form va .-straightened toggle .link ras shown Fig.

.The .lower end of'pawl 5t. is `arranged to engage .ratchet .diskf secured-to .a shaft 56 bya .pin 5l'. Shaft is .journaled inpandextends through the. side ofaswitchfboxx .iand .has secured .thereto :within .said switchfbox l an VAarm .59.. .Arm 59 V.carries anrelectrical Contact member 6|] having an exposed contact v.portion `.or'-. e lec tr de` Sila. .Portion-.5ilai-sladaptedgat times toengage another electrieal Contact .ii-l '.carried .Suitable Vconductorsbne of which is :shown .as

62 .will behconnected to .the contacts 6B `and .BI

.respectively .and will .form .part .ofthe circuit .of

the motor which drives :the :machinefand `particularly whichmoves .table .l5 .having the work Y 'W thereonvDisk 455. whichniaiormedrwith a ratchet rtooth 55a has .a .rod .5,522 projecting upwardly k.therefrom `the .end rof whichhas oon-V nected :thereto .one .end of a tensile coiled :spring M', .the Iother .end .of which. is connected Vto fa pin 65..projecting .from the .outer .side .of one .ofthe members l0.

Al pin 66 also ,projects .from the .4 and they will ,be retained .in .this gposition until arm-El -is swung about theiaxis .fof sha-ft'a.

l.andquickly brought toclosed position bymerely 2,334,787 i ff l' the cutter I2 tends to lift lthe work W. This forces up work holder 2'! against the tension of the spring which holds it in work engaging posi-- tion, such as .the spring '26 adisclosed, with the result that said work holder has beenimoved into the cutter. This, of course, causes serious dam- Yage to the machine. In order to avoid this action the flugs 2id -and screws 34 have been provided. The screws 34 can be adjusted so that the ends thereof willfen'gage the lever arm 21a before thev -I'nernber 2'! swings intothe path of the cutter. VThe 'objectionable 'action of work holding mem .fbe r,-2f1.moving intothe' cutter is therefore preventedjWork holder 21can also be nicelyxadjusted for its work holding position by adjust*- .ment yonf screws ..36 .which normally .engage levers .21d .and .position member 2.1 in its A.worlrholding position. Y'

Should the.operatorattemptto taire. too great j .va-cut olf the work W, provisionis. madeioristopfping the .machine .orthe .movementof tablel-E.

The member 401s providedandathiszcan.beposi-v .tioned Aat the proper distancefrom table .I5 Yso as .to'loe .engaged .by the Vwork W .if ftoowgreata .cut Vis, attempted... Screws '42 .extend .throughslots in member ll''lsothatit can-be verticallygadjusted. Should the work. thus engage .member wpsaid member'wilhbeswung .toward the-cutter and.will

rotate .shaftniafgthus rotating-.member .41 to im;y

arm Maegainstthe tensionof spring-48. Q'Ihe portion Jl-7120i member'lL-l vwill then .pressdown-j. Y .wardlyuponarm .5.0; E Ilhis will rotateshafta and oscillate arm 5l toward-cutter--l2, This action acts .to vbreak .the .toggle .formed Iby membersland .Eliandpawlis movedout of"en .gagement.withtoothjSEoL on ratchet disk .55. .Mfhen lthis lhappens spring .64. swings rod 55D, thusf osci1la.tir1g.disk .55 and .shaft '56 and .moving lcontact arm-59`dcwnward1yso vvthat .contact 60a.

is separated .from -contact 61. This .breaks -the motor circuit and table..l5and the .work .thereon -is stopped before .any damage .can .be friche. :The switch comprising members `6| =and 60 is easily swinging .rodjb .awayri'om .cutter l2.. This straightensithe toggle .formed by members 5.! `and .53 and. engages .pawl l5? with .diskfy55 so that -thepartsassumethe position shcwninEig. 4 with disclosed in applicants .priorjpatent abovereouter .sidevof member .L0 with'which .the .side of" vthereof. .Another .pin .6.7 ,projects from member lIl)adapted ,to beengagedby arm l5 |.,when .the

. .togglefor-med byinBmbeIsS-l andf53 is straight-1,.;

ened.-

Y, Y A .y In' .operation the machine is drivenand vcutter .|2Lis rotated Lin the direction shown by .the arhe'ld .thereon .and vis moved VVto and, past the cutter .12.- lThe workholders 20, 21 'and'Z'B arejprovided tc hold 'the Work 'firmly adjacent the cutter. It has been found in practice vthat Von some occasions when a.'heavy vout fis being taken that pawl {53 `engages to .control .the movements in is also provided with the roller 23.

.From Ithe above description-.it will be seenfthat Ihave provided a verysimplev andieicientstructure vfor producing :the-desiredbperation.of the .machine .and preventing objectionable :action thereof.

vention disclosed rherein hasbeen `.demonstrated rows'. Table I5 .is reciprocated and thework W, which 'isusually a`printin'g1plate', -is suitably in actual practica .foundtobe very successful J Y and .eicient and .-beingfccmmercially made'.

It will, 'of .course, .be understood .that various.

changes may .be .made in y.the form, idetails, .ar-

rangement and'proportions .of.the.narts with- Y I out .departing from .thescope ,of applicants in- Y i vention, .which generally stated,.,c.lo1nsists"infa device- .capable .Ofcarrying .out .the objects .above set forth, .in .the .parts and combinations, .of parts disclosed and .derredin wthe appended'claims. Whatis'c'laimed `1.' Iny combination with "a rotating byli-n'drivcal .to 'but the work .holder -'I was vnot .con- Vtrolled-as disclosed herein. -Work holder 20 here-V The structure .disclosed Kherein .consti- Y tutesra decided :advance-in .theart and arg-reatV improvement onV the machine..disc1osed and i claimedin-my ,prior patentabovenoted. .The incutter and a. table for moving a fiat piece of work to said cutter, a member disposed tol engage the 'cutter and a table for moving a iiat piece of work' to saidcuttx'er,` a member adj acent said cutter distop of said piece of work, said member beingl mounted for swinging movement toward and from said work, a pivot on which said memberis carried, alever arm projecting from said member at the opposite side `of saidpivot'from said member, a spring Aacting on said leverarmfor .swinging said member toward said work,ran adjustable stop for engaging said leverrarm to limitcthe movement of said member` toward said work and posed to engage the top fof said piece of work, said member being mounted for swinging movement toward and from said wcrkfthe space between said member and Ycutterfbeing. open and unobstructed, means tending to move said member toward Y the Work, means for limiting theV vmovementof said member toward said Work, an

an adjustable stop normally spaced from said lever arm for limiting thefrmovement vof said member in a direction away from said work` in r opposition to said'spring. t Y

2, In combination with a rotating cylindrical adjustableimeans for limiting the movement of c said member in a direction 'away from said work', n

said member having' capacity of movement to last-mentioned means.

swing into said cutter except asrestrained by said LEONARD CT QLANDER.` 

